/**
 * BrowserLauncher is a class that provides one static method, openURL, which opens the default
 * web browser for the current user of the system to the given URL.  It may support other
 * protocols depending on the system -- mailto, ftp, etc. -- but that has not been rigorously
 * tested and is not guaranteed to work.
 * <p>
 * Yes, this is platform-specific code, and yes, it may rely on classes on certain platforms
 * that are not part of the standard JDK.  What we're trying to do, though, is to take something
 * that's frequently desirable but inherently platform-specific -- opening a default browser --
 * and allow programmers (you, for example) to do so without worrying about dropping into native
 * code or doing anything else similarly evil.
 * <p>
 * Anyway, this code is completely in Java and will run on all JDK 1.1(or better)-compliant systems without
 * modification or a need for additional libraries.  All classes that are required on certain
 * platforms to allow this to run are dynamically loaded at runtime via reflection and, if not
 * found, will not cause this to do anything other than returning an error when opening the
 * browser.
 * <p>
 * There are certain system requirements for this class, as it's running through Runtime.exec(),
 * which is Java's way of making a native system call.  Currently, this requires that a Macintosh
 * have a Finder which supports the GURL event, which is true for Mac OS 8.0 and 8.1 systems that
 * have the Internet Scripting AppleScript dictionary installed in the Scripting Additions folder
 * in the Extensions folder (which is installed by default as far as I know under Mac OS 8.0 and
 * 8.1), and for all Mac OS 8.5 and later systems.  On Windows, it only runs under Win32 systems
 * (Windows 95, 98, and NT 4.0, as well as later versions of all).  On other systems, this drops
 * back from the inherently platform-sensitive concept of a default browser and simply attempts
 * to launch Netscape via a shell command.
 * <p>
 * This code is Copyright 1999 by Eric Albert (ejalbert@cs.stanford.edu) and may be redistributed
 * or modified in any form without restrictions as long as the portion of this comment from this
 * paragraph through the end of the comment is not removed.  The author requests that he be
 * notified of any application, applet, or other binary that makes use of this code, but that's
 * more out of curiosity than anything and is not required.  This software includes no warranty.
 * <p>
 * Credits:
 * <br>Steven Spencer, JavaWorld magazine (<a href="http://www.javaworld.com/javaworld/javatips/jw-javatip66.html">Java Tip 66</a>)
 * <br>Ron B. Yeh, ZeroG
 * <br>Ben Engber, The New York Times
 * <br>Paul Teitlebaum and Andrea Cantatore, Datatech Software
 *
 * @author Eric Albert (<a href="mailto:ejalbert@cs.stanford.edu">ejalbert@cs.stanford.edu</a>)
 * @version 1.2 (Released July 28, 1999)
 */

package org.iwidget.desktop.core;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
 * rewrite oleh
 * @author Muhammad Hakim A
 */


public class BrowserLauncher
{

    /**
     * The Java virtual machine that we are running on.  Actually, in most cases we only care
     * about the operating system, but some operating systems require us to switch on the VM. */
    private static int jvm;

    /** The browser for the system */
    private static Object browser;

    /**
     * Caches whether any classes, methods, and fields that are not part of the JDK and need to
     * be dynamically loaded at runtime loaded successfully.
     * <p>
     * Note that if this is <code>false</code>, <code>openURL()</code> will always return an
     * IOException.
     */
    private static boolean loadedWithoutErrors;

    /** The com.apple.mrj.MRJFileUtils class */
    private static Class mrjFileUtilsClass;

    /** The com.apple.mrj.MRJOSType class */
    private static Class mrjOSTypeClass;

    /** The com.apple.MacOS.MacOSError class */
    private static Class macOSErrorClass;

    /** The com.apple.MacOS.AEDesc class */
    private static Class aeDescClass;

    /** The <init>(int) method of com.apple.MacOS.AETarget */
    private static Constructor aeTargetConstructor;

    /** The <init>(int, int, int) method of com.apple.MacOS.AppleEvent */
    private static Constructor appleEventConstructor;

    /** The <init>(String) method of com.apple.MacOS.AEDesc */
    private static Constructor aeDescConstructor;

    /** The findFolder method of com.apple.mrj.MRJFileUtils */
    private static Method findFolder;

    /** The getFileType method of com.apple.mrj.MRJOSType */
    private static Method getFileType;

    /** The makeOSType method of com.apple.MacOS.OSUtils */
    private static Method makeOSType;

    /** The putParameter method of com.apple.MacOS.AppleEvent */
    private static Method putParameter;

    /** The sendNoReply method of com.apple.MacOS.AppleEvent */
    private static Method sendNoReply;

    /** Actually an MRJOSType pointing to the System Folder on a Macintosh */
    private static Object kSystemFolderType;

    /** The keyDirectObject AppleEvent parameter type */
    private static Integer keyDirectObject;

    /** The kAutoGenerateReturnID AppleEvent code */
    private static Integer kAutoGenerateReturnID;

    /** The kAnyTransactionID AppleEvent code */
    private static Integer kAnyTransactionID;

    /** JVM constant for MRJ 2.0 */
    private static final int MRJ_2_0 = 0;

    /** JVM constant for MRJ 2.1 or later */
    private static final int MRJ_2_1 = 1;

    /** JVM constant for any Windows 9x JVM */
    private static final int WINDOWS_9x = 2;

    /** JVM constant for any Windows NT JVM */
    private static final int WINDOWS_NT = 3;

    /** JVM constant for any other platform */
    private static final int OTHER = -1;

    /**
     * The file type of the Finder on a Macintosh.  Hardcoding "Finder" would keep non-U.S. English
     * systems from working properly.
     */
    private static final String FINDER_TYPE = "FNDR";

    /**
     * The creator code of the Finder on a Macintosh, which is needed to send AppleEvents to the
     * application.
     */
    private static final String FINDER_CREATOR = "MACS";

    /** The name for the AppleEvent type corresponding to a GetURL event. */
    private static final String GURL_EVENT = "GURL";

    /**
     * The first parameter that needs to be passed into Runtime.exec() to open the default web
     * browser on Windows.
     */
    private static final String FIRST_WINDOWS_PARAMETER = "/c";

    /** The second parameter for Runtime.exec() on Windows. */
    private static final String SECOND_WINDOWS_PARAMETER = "start";

    /**
     * The shell parameters for Netscape that opens a given URL in an already-open copy of Netscape
     * on many command-line systems.
     */
    private static final String NETSCAPE_OPEN_PARAMETER_START = " -remote openURL(";
    private static final String NETSCAPE_OPEN_PARAMETER_END = ")";

    /**
     * The message from any exception thrown throughout the initialization process.
     */
    private static String errorMessage;

    /**
     * An initialization block that determines the operating system and loads the necessary
     * runtime data.
     */
    static
    {
        loadedWithoutErrors = true;
        String osName = System.getProperty("os.name");
        if ("Mac OS".equals(osName))
        {
            String mrjVersion = System.getProperty("mrj.version");
            String majorMRJVersion = mrjVersion.substring(0, 3);
            try
            {
                double version =
                        Double.valueOf(majorMRJVersion).doubleValue();
                if (version == 2)
                {
                    jvm = MRJ_2_0;
                }
                else if (version >= 2.1)
                {
                    // For the time being, assume that all post-2.0 versions of MRJ work the same
                    jvm = MRJ_2_1;
                }
                else
                {
                    loadedWithoutErrors = false;
                    errorMessage = "Unsupported MRJ version: " + version;
                }
            }
            catch (NumberFormatException nfe)
            {
                loadedWithoutErrors = false;
                errorMessage = "Invalid MRJ version: " + mrjVersion;
            }
        }
        else if (osName.startsWith("Windows"))
        { //still needs verification against Win2K
            if (osName.indexOf("9") != -1)
            {
                jvm = WINDOWS_9x;
            }
            else
            {
                jvm = WINDOWS_NT;
            }
        }
        else
        {
            jvm = OTHER;
        }

        if (loadedWithoutErrors)
        { // if we haven't hit any errors yet
            loadedWithoutErrors = loadClasses();
        }
    }

    /**
      * This class should be never be instantiated; this just ensures so.
      */
    private BrowserLauncher()
{ }

    /**
      * Called by a static initializer to load any classes, fields, and methods required at runtime
      * to locate the user's web browser.
      * @return <code>true</code> if all intialization succeeded
      *			<code>false</code> if any portion of the initialization failed
      */
    private static boolean loadClasses()
    {
        switch (jvm)
        {
            case MRJ_2_0:
                try
                {
                    Class aeTargetClass = Class.forName("com.apple.MacOS.AETarget");
                    macOSErrorClass = Class.forName("com.apple.MacOS.MacOSError");
                    Class osUtilsClass = Class.forName("com.apple.MacOS.OSUtils");
                    Class appleEventClass = Class.forName("com.apple.MacOS.AppleEvent");
                    Class aeClass = Class.forName("com.apple.MacOS.ae");
                    aeDescClass = Class.forName("com.apple.MacOS.AEDesc");

                    aeTargetConstructor =
                            aeTargetClass.getDeclaredConstructor(
                            new Class []{ int.class });
                    appleEventConstructor =
                            appleEventClass.getDeclaredConstructor(
                            new Class[]{ int.class, int.class,
                            aeTargetClass, int.class, int.class });
                    aeDescConstructor = aeDescClass.getDeclaredConstructor(
                            new Class[]{ String.class });

                    makeOSType =
                            osUtilsClass.getDeclaredMethod("makeOSType",
                            new Class []{ String.class });
                    putParameter =
                            appleEventClass.getDeclaredMethod("putParameter",
                            new Class[]{ int.class, aeDescClass });
                    sendNoReply =
                            appleEventClass.getDeclaredMethod("sendNoReply",
                            new Class[]{ });

                    Field keyDirectObjectField =
                            aeClass.getDeclaredField("keyDirectObject");
                    keyDirectObject =
                            (Integer) keyDirectObjectField.get(null);
                    Field autoGenerateReturnIDField =
                            appleEventClass.getDeclaredField("kAutoGenerateReturnID");
                    kAutoGenerateReturnID =
                            (Integer) autoGenerateReturnIDField.get(null);
                    Field anyTransactionIDField =
                            appleEventClass.getDeclaredField("kAnyTransactionID");
                    kAnyTransactionID =
                            (Integer) anyTransactionIDField.get(null);
                }
                catch (ClassNotFoundException cnfe)
                {
                    errorMessage = cnfe.getMessage();
                    return false;
                }
                catch (NoSuchMethodException nsme)
                {
                    errorMessage = nsme.getMessage();
                    return false;
                }
                catch (NoSuchFieldException nsfe)
                {
                    errorMessage = nsfe.getMessage();
                    return false;
                }
                catch (IllegalAccessException iae)
                {
                    errorMessage = iae.getMessage();
                    return false;
                }
                break;
            case MRJ_2_1:
                try
                {
                    mrjFileUtilsClass = Class.forName("com.apple.mrj.MRJFileUtils");
                    mrjOSTypeClass = Class.forName("com.apple.mrj.MRJOSType");
                    Field systemFolderField =
                            mrjFileUtilsClass.getDeclaredField("kSystemFolderType");
                    kSystemFolderType = systemFolderField.get(null);
                    findFolder =
                            mrjFileUtilsClass.getDeclaredMethod("findFolder",
                            new Class[]{ mrjOSTypeClass });
                    getFileType =
                            mrjFileUtilsClass.getDeclaredMethod("getFileType",
                            new Class[]{ File.class });
                }
                catch (ClassNotFoundException cnfe)
                {
                    errorMessage = cnfe.getMessage();
                    return false;
                }
                catch (NoSuchFieldException nsfe)
                {
                    errorMessage = nsfe.getMessage();
                    return false;
                }
                catch (NoSuchMethodException nsme)
                {
                    errorMessage = nsme.getMessage();
                    return false;
                }
                catch (SecurityException se)
                {
                    errorMessage = se.getMessage();
                    return false;
                }
                catch (IllegalAccessException iae)
                {
                    errorMessage = iae.getMessage();
                    return false;
                }
                break;
        }
        return true;
    }

    /**
      * Attempts to locate the default web browser on the local system.  Caches results so it
      * only locates the browser once for each use of this class per JVM instance.
      * @return The browser for the system.  Note that this may not be what you would consider
      *	to be a standard web browser; instead, it's the application that gets called to
      *	open the default web browser.  In some cases, this will be a non-String object
      *	that provides the means of calling the default browser.
      */
    private static Object locateBrowser()
    {
        if (browser != null)
        {
            return browser;
        }
        switch (jvm)
        {
            case MRJ_2_0:
                try
                {
                    Integer finderCreatorCode =
                            (Integer) makeOSType.invoke(null,
                            new Object[]{ FINDER_CREATOR });
                    Object aeTarget = aeTargetConstructor.newInstance(
                            new Object[]{ finderCreatorCode });
                    Integer gurlType = (Integer) makeOSType.invoke(null,
                            new Object[]{ GURL_EVENT });
                    Object appleEvent = appleEventConstructor.newInstance(
                            new Object[]{ gurlType, gurlType, aeTarget,
                            kAutoGenerateReturnID, kAnyTransactionID });
                    // Don't set browser = appleEvent because then the next time we call
                    // locateBrowser(), we'll get the same AppleEvent, to which we'll already have
                    // added the relevant parameter. Instead, regenerate the AppleEvent every time.
                    // There's probably a way to do this better; if any has any ideas, please let
                    // me know.
                    return appleEvent;
                }
                catch (IllegalAccessException iae)
                {
                    browser = null;
                    errorMessage = iae.getMessage();
                    return browser;
                }
                catch (InstantiationException ie)
                {
                    browser = null;
                    errorMessage = ie.getMessage();
                    return browser;
                }
                catch (InvocationTargetException ite)
                {
                    browser = null;
                    errorMessage = ite.getMessage();
                    return browser;
                }
            case MRJ_2_1:
                File systemFolder;
                try
                {
                    systemFolder = (File) findFolder.invoke(null,
                            new Object[]{ kSystemFolderType });
                }
                catch (IllegalArgumentException iare)
                {
                    browser = null;
                    errorMessage = iare.getMessage();
                    return browser;
                }
                catch (IllegalAccessException iae)
                {
                    browser = null;
                    errorMessage = iae.getMessage();
                    return browser;
                }
                catch (InvocationTargetException ite)
                {
                    browser = null;
                    errorMessage = ite.getTargetException().getClass() +
                            ": " + ite.getTargetException().getMessage();
                    return browser;
                }
                String[] systemFolderFiles = systemFolder.list();
                // Avoid a FilenameFilter because that can't be stopped mid-list
                for (int i = 0; i < systemFolderFiles.length; i++)
                {
                    try
                    {
                        File file = new File(systemFolder,
                                systemFolderFiles[i]);
                        if (!file.isFile())
                        {
                            continue;
                        }
                        Object fileType = getFileType.invoke(null,
                                new Object[]{ file });
                        if (FINDER_TYPE.equals(fileType.toString()))
                        {
                            browser = file.toString(); // Actually the Finder, but that's OK
                            return browser;
                        }
                    }
                    catch (IllegalArgumentException iare)
                    {
                        browser = null;//browser;
                        errorMessage = iare.getMessage();
                        return null;
                    }
                    catch (IllegalAccessException iae)
                    {
                        browser = null;
                        errorMessage = iae.getMessage();
                        return browser;
                    }
                    catch (InvocationTargetException ite)
                    {
                        browser = null;
                        errorMessage = ite.getTargetException().getClass() +
                                ": " + ite.getTargetException().
                                getMessage();
                        return browser;
                    }
                }
                browser = null;
                break;
            case WINDOWS_NT:
                browser = "cmd.exe";
                break;
            case WINDOWS_9x:
                browser = "command.com";
                break;
            case OTHER: //fall through
            default:
                browser = "netscape";
                break;
        }
        return browser;
    }

    /**
      * Attempts to open the default web browser to the given URL.
      * @param url The URL to open
      * @throws IOException If the web browser could not be located or does not run
      */
    public static void openURL(String url) throws IOException
    {
        if (!loadedWithoutErrors)
        {
            throw new IOException("Exception in finding browser: " +
                    errorMessage);
        }
        Object browser = locateBrowser();
        if (browser == null)
        {
            throw new IOException("Unable to locate browser: " +
                    errorMessage);
        }
        switch (jvm)
        {
            case MRJ_2_0:
                Object aeDesc = null;
                try
                {
                    aeDesc = aeDescConstructor.newInstance(
                            new Object[]{ url });
                    putParameter.invoke(browser,
                            new Object[]{ keyDirectObject, aeDesc });
                    sendNoReply.invoke(browser, new Object[]{ });
                }
                catch (InvocationTargetException ite)
                {
                    throw new IOException(
                            "InvocationTargetException while creating AEDesc: " +
                            ite.getMessage());
                }
                catch (IllegalAccessException iae)
                {
                    throw new IOException(
                            "IllegalAccessException while building AppleEvent: " +
                            iae.getMessage());
                }
                catch (InstantiationException ie)
                {
                    throw new IOException(
                            "InstantiationException while creating AEDesc: " +
                            ie.getMessage());
                }
                finally { aeDesc = null; // Encourage it to get disposed if it was created
                          browser = null; // Ditto
                    } break;
            case MRJ_2_1:
                Runtime.getRuntime().exec(
                        new String[]{ (String) browser, url });
                break;
            case WINDOWS_NT://fall through
            case WINDOWS_9x:
                Runtime.getRuntime().exec( new String[]{ (String) browser,
                        FIRST_WINDOWS_PARAMETER,
                        SECOND_WINDOWS_PARAMETER, url });
                break;
            case OTHER:
                // Assume that we're on Unix and that Netscape is installed

                // First, attempt to open the URL in a currently running session of Netscape
                Process process =
                        Runtime.getRuntime().exec((String) browser +
                        NETSCAPE_OPEN_PARAMETER_START + url +
                        NETSCAPE_OPEN_PARAMETER_END);
                try
                {
                    int exitCode = process.waitFor();
                    if (exitCode != 0)
                    { // if Netscape was not open
                        Runtime.getRuntime().exec(
                                new String[]{ (String) browser, url });
                    }
                }
                catch (InterruptedException ie)
                {
                    throw new IOException(
                            "InterruptedException while launching browser: " +
                            ie.getMessage());
                }
                break;
            default:
                // This should never occur, but if it does, we'll try the simplest thing possible
                Runtime.getRuntime().exec(
                        new String[]{ (String) browser, url });
                break;
        }
    }
    // Driver to test class : buat tes doang
//    public static void main(String[] args) throws IOException
//    {
//        if (args.length != 1)
//            openURL("http://jampasir.wordpress.com");
//        else
//            openURL(args[0]);
//    }
}